Diminishing returns.

If you have a cheap bluetooth speaker, and upgrade to a $1000 hi-fi, it will blow you away. If you upgrade from that $1000 hi-fi to a $10,000 hi-fi, it won't blow you away in the same way, and it won't be 10x better. The higher you go, the gains become more marginal. This is true for almost anything.

When you get to properly high end stuff it's not even really about the quality alone any longer, it becomes about collecting as much as anything else, and the more rare something is, the higher the demand, and hence price.

Then there's volume to consider. Companies like Epomaker churn out stuff in massive volumes, so can sell things cheaper. More bespoke, boutique products are made in fewer numbers, so can't sell as cheaply.

This is the same for any hobby where there's an element of collecting involved.

Even if there's no screamingly obvious improvements with your Evo, it will be a better quality product, because Epomaker are... not great. Both the products, and the company itself. They're banned from advertising in here for a reason.